S. Handschuh, S. Staab, and A. Maedche. The Emerging Semantic Web, volume 75 of Frontiers in Artificial Intelligence and Applications, IOS press, (2001)
Y. Sure, C. Tempich, H. Pinto, and S. Staab. Intelligent Learning Infrastructures for Knowledge Intensive Organisations: A Semantic Web Perspective, chapter 14, Idea Group Publishing, Inc., (2005)